Rectangular beam generating light source
AssigneeDigital Projection Limited
InventorMartin Kavanagh
Life of this patent
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Abstract
A light source is provided that includes a reflector for generating a substantially rectangular beam. The light source may include an arc lamp that includes a magnetic field generation means in the vicinity of the arc for reducing the arc diameter, or a secondary reflection means for avoiding part of the light that is generated from being obscured by the arc lamp electrodes.
Claims16
A light source arranged to generate a substantially rectangular beam comprising an electrode and an electrode mounting means, wherein the electrode mounting means comprises a series of strips arranged such that expansion of the mounting means will cause a rotation of the electrode.
A light source comprising a reflector arranged to generate a substantially rectangular beam, an arc lamp and a magnetic field generation means in the vicinity of the arc arranged to reduce the arc diameter, the magnetic field generation means having a temperature dependent magnetic field so as to increase the size of the arc in the case of overheating of the lamp.
A light source comprising a reflector arranged to generate a substantially rectangular beam and a light generating means, wherein said beam is not of uniform cross section due to part of the reflector being obscured by the light generating means, and further comprising a secondary reflection means arranged to direct part of the reflected beam so as to compensate for the obscured region.
A light source comprising:
- a reflector arranged to generate a substantially rectangular beam;
- and
- an arc lamp including a pair of electrodes across which an arc may be generated, wherein at least one of the electrodes is fabricated from copper and tungsten and mounted directly onto a copper heat conductive mounting.
A light source comprising:
- an arc lamp including a pair of electrodes;
- and
- means for generating an arc between said pair of electrodes, wherein at least one of the electrodes is fabricated from copper and tungsten and mounted directly onto a copper heat conductive mounting.
A light source comprising:
- an arc lamp including a pair of electrodes;
- and
- means for generating an arc between said pair of electrodes, wherein at least one of the electrodes is fabricated as a copper post with a facing of tungsten.
Dependencies are inferred from the claim text.